today as a Russian spyship was on the move about 30 miles off the American coastline. Among a series of provocative military moves and the president was asked about it today. ABC's senior white house correspondent, Cecilia Vega tonight. Reporter: Tonight, the U.S. Navy is tracking this Russian spy ship, last seen off the coast of Virginia. The ship now making its way south after a stop near a Connecticut submarine base. ABC news got an up close look in 2015 when it docked in Havana. The ship is loaded with radar, a 30 MM cannon, anti-aircraft guns and electronic surveillance. Equipment that can intercept communications and help Russia spy on Navy operations. Today, president trump refusing to say exactly what he'd do about it. Instead offering this quip. The greatest thing I could do is shoot that ship that's is shoot that ship that's 30 miles off shore right out of the water. Everyone in this country's going to say, oh, it's so great. That's not great. That's not great. Reporter: Last Friday, Russian jets buzzed a Navy destroyer in the black sea, and Russia has secretly deployed a new cruise missile. A move that would violate an arms treaty. The president today pressed about the provocations. You mentioned the vessel, the spy vessel off the coast of the United States. Not good. Reporter: There was a ballistic missile test that many interpret as a violation of an agreement between the two countries; and a Russian plane buzzed a U.S. Destroyer. Not good. Reporter: Can we conclude there will be no response to these particular provocations? I'm not going to tell you anything about what response I do. I don't talk about military response. All right. Cecilia Vega with us here in new York tonight, and we all heard the president there talking about what he could do, shoot the ship, but said he is not going to do that. What are we wearing from military sources? Reporter: Right now, they are not too concerned, but they are monitoring this ship closely, and they have used this route before, and it's about 30 miles off the coast in international waters. Great to have you here in person tonight.

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